Now you must use Windows Basic Theme if you want to avoid : The Witcher 3: Wild Hunt is not responding, The Witcher 3: Wild Hunt has stopped working or The Witcher 3: Wild Hunt stuttering very bad outside.

How to use Basic theme ?

Right click anywhere on your desktop and then select Personalize then scroll down to Windows 7 Basic

Now play the game with basic theme and you have a chance to play without any errors !

Also you can switch back to your favorite theme anytime without compromising your computer !